Chemistry for nursing entrance exams worksheet with answers

DNA belongs to which group of biological molecules?

1. ANucleic acids
2. BCarbohydrates
3. CLipids
4. DProteins

What is absolute zero?

1. A−100 °C, the coldest temperature on Earth
2. B0 K, about −273 °C, the lowest possible temperature
3. C0 °F, the temperature of a salt and ice mixture
4. D0 °C, the point at which pure water freezes into ice

A cleaning solution has a pH of 12. How is it described?

1. AWeakly acidic
2. BStrongly basic
3. CStrongly acidic
4. DNeutral

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ASynthesis
2. BDecomposition
3. CCombustion
4. DSingle replacement

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. ADensity
2. BMass
3. CVolume
4. DTotal heat content

Which coefficients balance __Na + __Cl₂ → __NaCl?

1. A2, 2, 1
2. B1, 2, 1
3. C2, 1, 2
4. D1, 1, 1

Diamond is extremely hard and has a very high melting point. Which explanation is correct?

1. AIt is held together by ionic bonds between C⁺ and C⁻ ions
2. BIt is made of separate small molecules with strong forces between them
3. CIt contains delocalised electrons like a metal
4. DEach carbon is covalently bonded to four others in a giant network

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. AO²⁻
2. BMg²⁺
3. CF⁻
4. DNa⁺